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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec9d37f64ecc571f620c162323817d82336396bd7164c27512f399cd6ff032a' 
  AND token = 'V/y7tR6BiMmQv2ZJAd+MeAPUNG15iFGgvmAvGN2PXgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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