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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41c3ed5d04439b62cb1b2c5b31f99972939a70af8221f6671e26f001e863c69' 
  AND token = 'F8vJgXAaQzdvqci7oIi7RyZFrVRAG4I8qRrR2bocAcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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