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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0611668a76dec0e654a40368d78a5e4f925e7cdc8cc9445f65e3242488a724c0' 
  AND token = 'ZR9coPVC9WhEfWtOuGGXio4CtRuwhG2eDmG3TwlbRSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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