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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbba8adfcf5ad4723f5e8f0bb0dc6c8db8d0583a5bc8a6403a38bc3437a48ff8' 
  AND token = 'M4ZrLQfngihszue0ixwd9+LM8jPcWk+1RZCVkXdBvM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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