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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90295344a4cc0dd2ae5244dc1936b53c37ca48774a2eb3510e5a8ec510edf89d' 
  AND token = 'Q3MDb87155PriKd0WU5/zLFsYUi9ttEvotraGoydN6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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