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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b81cb5fbb23cea093beac2a0be22aaf7b3da0a74e76e8fc7f18be6cc40ac8d1a' 
  AND token = 'GLJHZ7sdQ8Z+Mp8Zp3/H1Uh3WDu12Zbig4AHEZ868zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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