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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed7bbd0b5977fc48d6293d469925a8a935bbb2d64bbf10c095d2ba13a1234a7' 
  AND token = '+h4rWdTrTatYPaO0h5h57J453onFMiswlbj6Fjmlxx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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