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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd6f15edb63c9f2369d3610d953a4925bf1bf3792a627122e3502ab9c48cb1c' 
  AND token = 'ByvRv70gZXFK1+L4gzStXBfvMcWuNuloeAP69EW1Dgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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