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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d61846d900c07972b27db615808c3bf3e7d9705e74b6a2eee883b42c7601b7' 
  AND token = 'hLX/KBgKh2takAFQTLZNIRk1nHrrbmV110lsqqmMAn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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