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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a632907d5db37ff8e55d4e91cf9b0fd58a272ead28fd6420cbe8184f57cd7b5' 
  AND token = 'gVEGY4RATtYthfjMEd2Quq3DFqcg1On7kf30EH6dg/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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