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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc787e6b216831c02ad8002bad7956b8a2e6294fb80177d706c6036356db0dd' 
  AND token = 'VFdkL6RETVt5NpOJIOoP7ZgaraXTcKsuewuEEmgVkzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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