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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0549f38f1471f1e8df438eefa4e52270aed43f96687f8ff71b7fb5d77a4e69' 
  AND token = 'ketgnBpOKT7r7Agj5O1hjvQqMnS5HsolDL5UwmVbMO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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