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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86507ce13e6257b1b60065520f9e11a41bfd0f7d8e219c4de7721717ef77ee0' 
  AND token = 'gJi9X3AH8680sYrURo/89nu6np1IBdlHnDLQag6IFBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}