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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab48e708bd6646cb5cac46362200032a9a872caae4abf33784df24258d7bd72f' 
  AND token = 'I4OPf436go1JyE1a7yaUJB2ajgjNl4pZtq5l85v05Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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