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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3fea70a51c46f902d5dba322636a6df26272fd21d6eda87d38e00628589d22' 
  AND token = 'fHpDu92PNQocD6Ss8Lu/E0UVPySge8ea0PRg3JxiZmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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