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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdb67057e035a78f6f13163d0420c82f0b00afd869190fc85ddf2814d450212' 
  AND token = 'FLLXQw9buweK+5naigMRwrS9cLkVWCoayS1bEZ0K6Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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