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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45d2050e4c9770f563aa0a06f57356dd6a03b67c2b813cff957bfc34e016ddf' 
  AND token = '2a5WpAogBlESLy7hD3kscO2vZ1pw+/LMcXhF2ZJh53U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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