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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f0adc826db4a2c0e6fb2e423baa8685fe313f61fab38e8dc538a74616de63b' 
  AND token = '3wUgay76Y9A2kBuGH6gNppkXfdiUibrSa+LTypgQbzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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