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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8354f8699f4fbb8971750b8fa497af714a07e8025fd475375410b2db2c594eb0' 
  AND token = 'qkx0LDWiZhWaZ2sev5SfOF57L1zHySw/d5eeez1ZBC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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