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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfc27dd6dede7b7632a177309155e684a1481927d388cd221c514ee9a4d28e7' 
  AND token = 'f7PgeoTwgxXc7BOZ8qoAVSOW60mmhvV4q/gwXM744mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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