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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fa65d814905c214b3f0043c82c135c0b009a074cff26fc0c0240659e995bd6' 
  AND token = 'rzTWD2cP3ZiLfMtbYhkfeg6FBHfE6YaSiWd5yIJIwWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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