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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890816cee611b25ce219493f8e8ae5e6e9798a7bb09b010f6bd3633a4ce17e49' 
  AND token = '03YboKpDCYlw1JOSPtIi0N0gGUaUN4CFXzG4iqdtT3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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