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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13de3970e2cb07b470a9aa3553f6730b6efaddcd5e3af437eaff4c0358f87124' 
  AND token = '24VspIdVCoD/pNhU0+gsFxu/U9P3Q3xMexlbdGPeRWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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