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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e26e4d1538e4b55fde57857ec5bbe9bd0b737b31cd69c588f23b1f8ded0b296' 
  AND token = '/k45X7SCzy3CEpYz5JnEmr8cW6KDRq+x4YcrC+aPoDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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