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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e02b3bd3182aa73a4b5cff14f9fa0c6cac8f4a859294b07c9c736a0cb6fc024' 
  AND token = 'xcleTTnBkG386nNpfnIJdgRePG2+kEuDx+TESGXkYkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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