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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b26bc6d971f215d22229732ed38c7285428f437eae105e6295ee1423f503b9' 
  AND token = 'b4ahuy1e2D9JTs09x5ILBM+IGdsCueL/V9q0Rys40Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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