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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f928d4d6c2040506032c0946f31ef23be0cd65da7843c55d21b75afa7946c9b' 
  AND token = 'cXVgzLWhKr4yS458mMXcP9+U2FwGaiWGL7rcBNMIur4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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