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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbe5e67577f238589f5ba854961fd1a6231219e921d54fa33f617f0b8ec484d' 
  AND token = '5/HfDTMl/2bIfe/Oy/IDFvTqOL/XlfYEil9AFl01EEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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