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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9b3199febaa7434aa6bfe0a0bc11d27788defbd998e3ccb101434afd5c262e' 
  AND token = 'Ar3L7Lh82UzWhHko6yCxl+Brb2zDC45JzF6V/s/KfZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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