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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791a6026b770b7df0aadf5e544decf1fd7a5fc7b6af6d8aa34c606b3b518d25c' 
  AND token = '1YXeG+KK2/D8yRtrqvVQNzIa4HepMO2oOpGMCM7fCmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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