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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e0c540a4fbe967b4a2eda6d8185ca6c99b62e31224030153129f7ce3abfd92' 
  AND token = 'jh9hV9b3nn49BUX0FVcLHumZRj1xA1LVhuQH30bKAhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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