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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84a5e23560604bb0e01e84a3bfc9ce1e5f53f2ce13d6fd6122ce57786d178f0' 
  AND token = 'Kgv5zk1mmGYZPOFdAzLt2q1iwB2pzwUWEyhix1bW570=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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