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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695cb1a80aa4e7b86304b844e7929b419bc787953f689168009ce8586b6288dc' 
  AND token = 'q+QouwC7/mrnF/O/D0jIZOtbIX3bkjSztF6JB+SwZ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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