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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1a8be6e0266cf41bfae95641c99c3849e2a8ace7402ea77d25133454386451' 
  AND token = 'bNdRYQpX0MTwbdJWILlDOhT9JOxvKsep12+1CVpcQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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