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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a2bc1d4fae8a7c3b3fc32806d362bd019a35ef712986b912d393901e15e271' 
  AND token = '5gqBuin3OnH9k6yROA+nEhkSI0yHUbNKC4/N+nHrsKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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