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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f76e7d6111073700b910284e787a4130af72e6d1004bc8ea379611d228d9f41' 
  AND token = 'mGgSM+LYoLMUJ5F2XrGpvOAb01aIEqQ3/1smz1VaBwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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