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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acab608b823a13f0d6385168a51a5944ab65033b211d2546ab7ba77b00464cb' 
  AND token = 'IMiu4Wvgs31zT08TrXYcY+wbwKQ5Vh7rA8kMt88d/Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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