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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8442368424517786b573529c034a8076dfb14a0aca25fe650e31d14399e135' 
  AND token = 'Yy/KIfzSS5TRS7L60yDIkvaqW9WFChF21eU6KknIwrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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