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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee35ee1375044914f654bdb9149af8b52848c4dc8f3cc2ff9e8cf95133de034c' 
  AND token = 'X3KsxLueaYUptA7hDY94bdGEQnOb7ymL+bQk2cbR7kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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