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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd651e50ed0a309574ca5e9a1144484f4c13332ca9bb740cbdcb4e06ba1f4f207' 
  AND token = 'WzaKBf/B5gB2MP7vXoxcVUBf10CoM8LPNOUSRD++rXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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