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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3c9ba14f7a781ce910e67324a072ab4495f7bc97c5bdf066944e223a0dd647' 
  AND token = 'CJ1rcDB8uTEOdG8/+2ZIQ2bf+3EoP4UoAgEUJ6vZ5jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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