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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5707020022fd3a9563bd049e1ca5ebe6542816e6dfabcc6f4a852ebf87f95f04' 
  AND token = '3iVKUbYa+qcjc7qqSROzkke141gadk7g1VY8fS667ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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