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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a977dfab3e810928363ae5c17badc141a948807f5bb496d6e3656e49d30b8fea' 
  AND token = '/q/CNKLxPwxOcPS5YlU4YK7ooLzbTPr1Re9XPplngiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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