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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c25db87debfc07a66be97f1738c1b26b226e08dcddc7cb7c891c3e078cc61d2' 
  AND token = 'oq5ZHvfUqVD26NemjUksQGwUeZuXgx4hWJ0O0am6dD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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