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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c9f897155e801e5c1dca0c483315bb817feb7374a0a345c197edee094ed16a' 
  AND token = 'TyNzM4f+OIIps/Ca1/j5LvbP8Q32eSU1MpHExXyFnag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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