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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8d8eef17ae72c6771d495b0da46a78ffa5fe906e85662f513e07dd40c91c9c' 
  AND token = 'yF7yCqyYYpbRuJaKHxyT1ybk/t0aRlyVCIrtwme/eQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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