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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fdab543901004f713590cda43e4395cd958f6e76bddfe22b9ff0b4153b8d2b' 
  AND token = 'eTyNc3x/8olGuyBP/okW1UgtcU1uDCsGjovWPcnixwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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