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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f57c09a23c84b78ed0ae2d5d80808aaed0293db8ce63124a4a7f4d2a7033743' 
  AND token = '82OjUi15d8cH5+JjdGKHfpR/+w/pij6ltB9EN+WN0co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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