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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34aec34c1397ee2bced87e7c95ee18d0f13268fa07ebf0a4e00efd356dc76f9' 
  AND token = 'n/9fDrtqs9qcNtoV+0Gl+XjwMsJMbHuGH9AvRgKqBM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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