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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55366b2a1fc07aa3db9870c4417bd262d663154c84f8ae0a1b8f22e20bd41daa' 
  AND token = 'RMiej4uWC2eocLyfDXLQ5oSXlT78sWPxSPqIEE+74eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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