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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe2d19950c02ae9e4e61c20e7746a0eb1ae124e2fd1224b755083bac2b94316' 
  AND token = 'Ge70l5MZ7zlL+CpyUTsRwrR63FQzlih/YB+S6GFMrig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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