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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092f3b05ab708efc27561271fdc7806c52968399f61e8216b4354c7d0df94f6d' 
  AND token = 'QHdfotAnf/Gz1/0EBKfrM3EVdyGTFGgB8jUnSdQUqrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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