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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3927eeb059c7467b992097ce8ee2264ca02833b85b98f49e82188e7bdae65d7' 
  AND token = 'Q1EFq0yOKecL6CmRVrNIP6Iuj1ydcCi9PGAdHMToQkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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