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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335cb92d2ad1f07537e0cf60a61c02e6a82b4ea1b9ad8947b6e4d3fae50b43b2' 
  AND token = 'DW0zYZwA8UlPpWN6jmrmFLLasQ095TrzweA/xJYJWLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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