SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa2df4c48472adbb55dde4e5c2329a163241b085f77678e229f51e0b73f7b5b' 
  AND token = 'BWS1Qr4gPCLmPNQxLgqlqGgIRJ8jS4ZZhv6pAlyokuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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