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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfca1b4569dc855044f5138a959ed35a89581bd9745ed4ac6ca7bb9628cbe33' 
  AND token = '6o/TGPFQAVXL2lnGzq73+tytH06WsyYBquig60UarFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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