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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6213a626515851f00c81266ebb40a758d2d7eef0b5bfe2ed0a282695d10f56e' 
  AND token = '11GM5Jo0rOs6EmfPszixeln/D7cjTO3fzKWfY5mpoJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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