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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d7a725716d3d1c7c6dd71be1f6bca794746a7eb3f461abca50285733d7723b' 
  AND token = 'zhlKko+PBULkisLz4hPlARhqHjk7+/Kk9h9vF4Cawc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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