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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c1199fa9adddf8aa6634d213a1fba40445022dca8c59dbed7afa5b125fd670' 
  AND token = 'f6oBlXPz3PkPuMVzW427y9UbnOke7WnKchlv9N7PgLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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