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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ddb40fba7fb6675d3693f7d4aa236718b1838784b006879893e02be0d6b7278' 
  AND token = 'udSmtjtBjIRJP87AL7YKoMU8uM4oFUA1wVSI335h1NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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