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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683b86d4c052c6e9544dc1c7b412a7a8ace2c5e964ec78b6cf945e4a949b1463' 
  AND token = 'of5k48V1GxqWmeEuq9a55EsNkHyYQKyNUtnBG+CCHIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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