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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ea0baf8a0516581ef32edf5409135fa1d08178a5aab97cfeea432b9e87bc06' 
  AND token = 'L2dnSAc1lRZIL3b4b98l8utcnH4KN4K/IHwrQVYc500=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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