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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02c6a5c502c5055fb54d7ac32c6e22431998a1b93f14ff5357aedccf26f1fd0' 
  AND token = 'VG9YjWOrNBsbvK3DnwwgaTThax2eCk+AHUS9AMe1dIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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