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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e6520bf6c363883fae45c04d3141d1270a263c9cb9944aa6510b6f417e3ac5' 
  AND token = 'KgWMYDviMGv4ravFCPSVyhPth93e8GiSkhrSzn8uVaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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