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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0aa6aacaa508a5209ce78c84ed9c805d53d39e0483ca6a33a07ecb64bea4dff' 
  AND token = 's/aVwB/y3hg3O/vRnmUBf61z/woqvaH9B0ubwoWa4w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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